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首页> 外文学位 >Effect of reactive compatibilization on the morphology and physical properties of bisphenol-A-polycarbonate/acrylonitrile-butadiene-styrene blends.
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Effect of reactive compatibilization on the morphology and physical properties of bisphenol-A-polycarbonate/acrylonitrile-butadiene-styrene blends.

机译：反应性相容化对双酚A-聚碳酸酯/丙烯腈-丁二烯-苯乙烯共混物的形态和物理性能的影响。

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摘要

An amine functional styrene-acrylonitrile (SAN-amine) polymer is proposed as a reactive compatibilizer for bisphenol-A-polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends. This polymer is miscible with the styrene/acrylonitrile (SAN) copolymer matrix of ABS materials, and the pendant secondary amine groups react with PC at the carbonate linkage to form a SAN-g-PC copolymer. The graft copolymer molecules reside at the PC/ABS interface and provide improved morphological stability at elevated temperatures by suppressing phase coalescence. The synthesis of this reactive compatibilizer and its reaction with carbonate moieties is described. Characterization of this reaction was done by NMR and GPC using model secondary amine and carbonate containing compounds. A technique was developed for the quantitative measurement of the kinetics of dispersed phase particle coalescence in these blends; the morphology was examined using TEM. While uncompatibilized PC/SAN blends showed an increase in particle size from approximately 1 {dollar}mu{dollar}m to 2 {dollar}mu{dollar}m (depending on PC viscosity) in less than five minutes at 270{dollar}spcirc{dollar}C; compatibilized blends containing as little as 1% SAN-amine exhibited no change in morphology after 20 minutes.; The effects of dispersed phase concentration, viscosity ratio and interfacial compatibilization using the SAN-amine compatibilizer on the process induced morphology of PC/SAN blends were also examined. Dispersed phase particle size increased significantly with SAN concentration and, although the morphology of uncompatibilized PC/SAN blends mixed in a Brabender mixer, single and twin screw extruders were quite similar, the twin screw extruder produced significantly finer morphologies in blends containing SAN-amine. The average particle size for blends compatibilized with the SAN-amine polymer was approximately half that of uncompatibilized blends and was relatively independent of viscosity ratio and dispersed phase composition.; The fracture of thin (3.18 mm) and thick (6.35 mm) specimens of PC, ABS and PC/ABS blends with both standard and sharp notches was examined by standard Izod and single edge notch three point bend (SEN3PB) instrumented drop tower tests. Load-deflection data were analyzed as a function of ligament length and fracture parameters were calculated using the theoretical framework of the essential work of fracture concept. The effects of blend composition, temperature, rubber concentration and reactive compatibilization on the fracture properties of these materials were examined.
机译：提出了一种胺官能的苯乙烯-丙烯腈（SAN-胺）聚合物作为双酚A-聚碳酸酯/丙烯腈-丁二烯-苯乙烯（PC / ABS）共混物的反应性增容剂。该聚合物可与ABS材料的苯乙烯/丙烯腈（SAN）共聚物基质混溶，并且仲胺侧基在碳酸酯键处与PC反应形成SAN-g-PC共聚物。接枝共聚物分子位于PC / ABS界面处，并通过抑制相聚结在高温下提供改进的形态稳定性。描述了该反应性增容剂的合成及其与碳酸酯部分的反应。使用模型仲胺和含碳酸盐的化合物，通过NMR和GPC对该反应进行表征。开发了一种用于定量测量这些共混物中分散相颗粒聚结动力学的技术。使用TEM检查形态。虽然不相容的PC / SAN混合物在270摄氏度时不到五分钟的时间内，粒径就从大约1 {μm}美元增加到2 {μm}美元（取决于PC粘度）。 {dollar} C;含有低至1％SAN-胺的相容混合物在20分钟后仍未表现出形态变化。还检查了分散相浓度，粘度比和使用SAN-胺增容剂的界面增容对PC / SAN共混物加工诱导的形貌的影响。分散相的粒径随SAN浓度的增加而显着增加，尽管在Brabender混合机中混合的不相容PC / SAN混合物的形态非常相似，单螺杆和双螺杆挤出机非常相似，但双螺杆挤出机在含SAN-胺的共混物中产生了明显更好的形态。与SAN-胺聚合物相容的共混物的平均粒径约为未相容的共混物的一半，并且相对独立于粘度比和分散相组成。通过标准的艾佐德（Izod）和单边缺口三点弯曲（SEN3PB）仪器进行的落塔测试，检查了PC，ABS和PC / ABS共混物的薄（3.18毫米）和厚（6.35毫米）试样的断裂。分析了载荷挠度数据与韧带长度的关系，并使用断裂概念基本工作的理论框架计算了断裂参数。研究了共混物组成，温度，橡胶浓度和反应性相容性对这些材料的断裂性能的影响。

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